Theming

A guide to styling components with our color system.

Overview

Our styling system builds upon shadcn/ui's CSS variables approach with additional status colors and design tokens.

Installation

Copy and paste the following into your globals.css file:


:root {
  --radius: 0.75rem;
 
  --neutral-hue: 270;
  --neutral-chroma: 0.004;
  --neutral-chroma-low: 0.002;
 
  /* Background colors, the page is surface-1, cards and popovers surface-3. */
  --background: var(--surface-1);
  --foreground: oklch(0.18 var(--neutral-chroma) var(--neutral-hue));
 
  --card: var(--surface-3);
  --card-foreground: var(--foreground);
  --popover: var(--surface-3);
  --popover-foreground: var(--foreground);
 
  /* Primary & accent colors */
  --primary: oklch(0.6 0.2 250);
  --primary-foreground: oklch(1 0 0);
  --primary-soft-foreground: var(--primary);
  --neutral: oklch(0.21 var(--neutral-chroma) var(--neutral-hue));
  --neutral-foreground: oklch(
    0.98 var(--neutral-chroma-low) var(--neutral-hue)
  );
  --secondary: oklch(0.92 0 0);
  --secondary-foreground: oklch(0.32 var(--neutral-chroma) var(--neutral-hue));
  --muted: oklch(0.94 0 0);
  --muted-foreground: oklch(0.5 var(--neutral-chroma) var(--neutral-hue));
  --accent: oklch(0.91 0 0);
  --accent-foreground: oklch(0.22 var(--neutral-chroma) var(--neutral-hue));
  --destructive: oklch(0.53 0.19 25);
  --destructive-foreground: oklch(
    0.98 var(--neutral-chroma-low) var(--neutral-hue)
  );
  /* Same idea for `destructive-soft`'s label on its tinted plate. */
  --destructive-soft-foreground: var(--destructive);
 
  --chrome: var(--neutral);
  --chrome-foreground: var(--neutral-foreground);
  --chrome-muted-foreground: color-mix(
    in oklab,
    var(--chrome-foreground) 71%,
    var(--chrome)
  );
  --chrome-hover: color-mix(
    in oklab,
    var(--chrome-foreground) 10%,
    transparent
  );
  --chrome-border: color-mix(
    in oklab,
    var(--chrome-foreground) 12%,
    transparent
  );
 
  --primary-hover: color-mix(in oklch, var(--primary), black 5%);
  --neutral-hover: color-mix(in oklch, var(--neutral), white 10%);
  --destructive-hover: color-mix(in oklch, var(--destructive), black 5%);
  --secondary-hover: color-mix(in oklch, var(--secondary), black 5%);
  --outline-hover: color-mix(in oklch, var(--card), black 5%);
 
  /* Pressed, one step past hover in the same direction. */
  --primary-active: color-mix(in oklch, var(--primary), black 8%);
  --neutral-active: color-mix(in oklch, var(--neutral), white 14%);
  --destructive-active: color-mix(in oklch, var(--destructive), black 8%);
  --secondary-active: color-mix(in oklch, var(--secondary), black 8%);
  --outline-active: color-mix(in oklch, var(--card), black 8%);
 
  /* Borders & inputs */
  --border: color-mix(in oklab, var(--foreground) 10%, transparent);
  --input: var(--surface-3);
  --input-elevated: oklch(0 0 0 / 8%);
  --ring: oklch(0.55 0.2 250);
  --scrollbar: oklch(0.87 0 0);
 
  --sidebar: var(--surface-1);
  --sidebar-foreground: var(--foreground);
  --sidebar-primary: var(--primary);
  --sidebar-primary-foreground: var(--primary-foreground);
  --sidebar-accent: var(--accent);
  --sidebar-accent-foreground: var(--accent-foreground);
  /* Opaque --border, for the resize rail where a translucent line is too faint. */
  --sidebar-border: oklch(0.9 var(--neutral-chroma) var(--neutral-hue));
  --sidebar-ring: var(--ring);
 
  /* Status colors */
  --danger: oklch(0.97 0.04 25);
  --danger-foreground: oklch(0.55 0.18 25);
  --danger-border: oklch(0.9 0.1 25);
  --warning: oklch(0.98 0.06 85);
  --warning-foreground: oklch(0.58 0.14 85);
  --warning-border: oklch(0.92 0.1 85);
  --info: oklch(0.97 0.04 250);
  --info-foreground: oklch(0.45 0.2 250);
  --info-border: oklch(0.9 0.1 250);
  --success: oklch(0.97 0.04 145);
  --success-foreground: oklch(0.48 0.18 145);
  --success-border: oklch(0.9 0.1 145);
 
  --surface-1: oklch(0.97 0 0);
  --surface-2: oklch(0.985 0 0);
  --surface-3: oklch(1 0 0);
  --surface-4: oklch(1 0 0);
  --surface-5: oklch(1 0 0);
  --surface-6: oklch(1 0 0);
  --surface-7: oklch(1 0 0);
  --surface-8: oklch(1 0 0);
 
  --surface-hover: oklch(0 0 0 / 0.06);
  --surface-active: oklch(0 0 0 / 0.08);
  --surface-selected: oklch(0 0 0 / 0.1);
  --surface-rim-color: oklch(0 0 0 / 0);
 
  --surface-shadow-ring: oklch(0 0 0 / 0.06); /* crisp edge */
  --surface-shadow-near: oklch(0 0 0 / 0.06); /* 1px blur (contact) */
  --surface-shadow-mid: oklch(0 0 0 / 0.05); /* 3–6px blur */
  --surface-shadow-far: oklch(0 0 0 / 0.04); /* 12–24px blur */
  --surface-shadow-ambient: oklch(0 0 0 / 0.03); /* 48–96px blur */
  --surface-shadow-1: 0 0 0 1px var(--surface-shadow-ring);
  --surface-shadow-2:
    0 0 0 1px var(--surface-shadow-ring),
    0 1px 1px -0.5px var(--surface-shadow-near);
  --surface-shadow-3:
    0 0 0 1px var(--surface-shadow-ring),
    0 1px 1px -0.5px var(--surface-shadow-near),
    0 3px 3px -1.5px var(--surface-shadow-mid);
  --surface-shadow-4:
    0 0 0 1px var(--surface-shadow-ring),
    0 1px 1px -0.5px var(--surface-shadow-near),
    0 3px 3px -1.5px var(--surface-shadow-mid),
    0 6px 6px -3px var(--surface-shadow-mid);
  --surface-shadow-5:
    0 0 0 1px var(--surface-shadow-ring),
    0 1px 1px -0.5px var(--surface-shadow-near),
    0 3px 3px -1.5px var(--surface-shadow-mid),
    0 6px 6px -3px var(--surface-shadow-mid),
    0 12px 12px -6px var(--surface-shadow-far);
  --surface-shadow-6:
    0 0 0 1px var(--surface-shadow-ring),
    0 1px 1px -0.5px var(--surface-shadow-near),
    0 3px 3px -1.5px var(--surface-shadow-mid),
    0 6px 6px -3px var(--surface-shadow-mid),
    0 12px 12px -6px var(--surface-shadow-far),
    0 24px 24px -12px var(--surface-shadow-far);
  --surface-shadow-7:
    0 0 0 1px var(--surface-shadow-ring),
    0 1px 1px -0.5px var(--surface-shadow-near),
    0 3px 3px -1.5px var(--surface-shadow-mid),
    0 6px 6px -3px var(--surface-shadow-mid),
    0 12px 12px -6px var(--surface-shadow-far),
    0 24px 24px -12px var(--surface-shadow-far),
    0 48px 48px -24px var(--surface-shadow-ambient);
  --surface-shadow-8:
    0 0 0 1px var(--surface-shadow-ring),
    0 1px 1px -0.5px var(--surface-shadow-near),
    0 3px 3px -1.5px var(--surface-shadow-mid),
    0 6px 6px -3px var(--surface-shadow-mid),
    0 12px 12px -6px var(--surface-shadow-far),
    0 24px 24px -12px var(--surface-shadow-far),
    0 48px 48px -24px var(--surface-shadow-ambient),
    0 96px 96px -48px var(--surface-shadow-ambient);
 
  --surface-rim-1: 0 0 transparent;
  --surface-rim-2: 0 0 transparent;
  --surface-rim-3: 0 0 transparent;
  --surface-rim-4: 0 0 transparent;
  --surface-rim-5: 0 0 transparent;
  --surface-rim-6: 0 0 transparent;
  --surface-rim-7: 0 0 transparent;
  --surface-rim-8: 0 0 transparent;
 
  --surface-shadow-combined-1: var(--surface-shadow-1), var(--surface-rim-1);
  --surface-shadow-combined-2: var(--surface-shadow-2), var(--surface-rim-2);
  --surface-shadow-combined-3: var(--surface-shadow-3), var(--surface-rim-3);
  --surface-shadow-combined-4: var(--surface-shadow-4), var(--surface-rim-4);
  --surface-shadow-combined-5: var(--surface-shadow-5), var(--surface-rim-5);
  --surface-shadow-combined-6: var(--surface-shadow-6), var(--surface-rim-6);
  --surface-shadow-combined-7: var(--surface-shadow-7), var(--surface-rim-7);
  --surface-shadow-combined-8: var(--surface-shadow-8), var(--surface-rim-8);
 
  --chrome-shadow: var(--surface-shadow-1);
}
 
.dark {
  /* Dark-mode color overrides */
  --foreground: oklch(0.94 var(--neutral-chroma) var(--neutral-hue));
  --neutral: oklch(0.95 var(--neutral-chroma) var(--neutral-hue));
  --neutral-foreground: oklch(0.13 var(--neutral-chroma) var(--neutral-hue));
  --secondary: oklch(0.35 var(--neutral-chroma) var(--neutral-hue));
  --secondary-foreground: oklch(0.94 var(--neutral-chroma) var(--neutral-hue));
  --muted: oklch(0.24 var(--neutral-chroma) var(--neutral-hue));
  --muted-foreground: oklch(0.73 var(--neutral-chroma) var(--neutral-hue));
  --accent: oklch(0.31 var(--neutral-chroma) var(--neutral-hue));
  --accent-foreground: oklch(0.95 var(--neutral-chroma) var(--neutral-hue));
  --destructive: oklch(0.5 0.22 25);
  --destructive-foreground: oklch(1 0 0);
  /* Brightened so primary-soft's label stays readable on the darker plate. */
  --primary-soft-foreground: color-mix(in oklch, var(--primary), white 30%);
  /* Same treatment for destructive-soft's label on its tinted plate. */
  --destructive-soft-foreground: color-mix(
    in oklch,
    var(--destructive),
    white 30%
  );
 
  --chrome: oklch(0.159 var(--neutral-chroma) var(--neutral-hue));
  --chrome-foreground: var(--foreground);
  --chrome-muted-foreground: color-mix(
    in oklab,
    var(--chrome-foreground) 71%,
    var(--chrome)
  );
  --chrome-hover: color-mix(
    in oklab,
    var(--chrome-foreground) 10%,
    transparent
  );
  --chrome-border: color-mix(
    in oklab,
    var(--chrome-foreground) 12%,
    transparent
  );
 
  /* Dark hover, mix toward white so hovered buttons brighten. */
  --primary-hover: color-mix(in oklch, var(--primary), white 10%);
  --neutral-hover: color-mix(in oklch, var(--neutral), black 10%);
  --destructive-hover: color-mix(in oklch, var(--destructive), white 15%);
  --secondary-hover: color-mix(in oklch, var(--secondary), white 5%);
  --outline-hover: color-mix(in oklch, var(--card), white 5%);
 
  --primary-active: color-mix(in oklch, var(--primary), white 14%);
  --neutral-active: color-mix(in oklch, var(--neutral), black 14%);
  --destructive-active: color-mix(in oklch, var(--destructive), black 8%);
  --secondary-active: color-mix(in oklch, var(--secondary), white 8%);
  --outline-active: color-mix(in oklch, var(--card), white 8%);
 
  --border: color-mix(in oklab, var(--foreground) 10%, transparent);
  --input-elevated: oklch(1 0 0 / 9%);
  --scrollbar: oklch(0.7 var(--neutral-chroma) var(--neutral-hue));
 
  /* Only --sidebar-border needs a dark value; the rest are aliases. */
  --sidebar-border: oklch(0.28 var(--neutral-chroma) var(--neutral-hue));
 
  /* Status */
  --danger: oklch(0.26 0.07 25);
  --danger-foreground: oklch(0.75 0.15 25);
  --danger-border: oklch(0.36 0.11 25);
  --warning: oklch(0.28 0.06 85);
  --warning-foreground: oklch(0.78 0.12 85);
  --warning-border: oklch(0.38 0.09 85);
  --info: oklch(0.26 0.07 250);
  --info-foreground: oklch(0.72 0.16 250);
  --info-border: oklch(0.36 0.11 250);
  --success: oklch(0.26 0.07 145);
  --success-foreground: oklch(0.72 0.15 145);
  --success-border: oklch(0.36 0.11 145);
 
  /* Surface ladder, progressive lightness with brand-hue tint */
  --surface-1: oklch(0.205 var(--neutral-chroma) var(--neutral-hue));
  --surface-2: oklch(0.235 var(--neutral-chroma) var(--neutral-hue));
  --surface-3: oklch(0.264 var(--neutral-chroma) var(--neutral-hue));
  --surface-4: oklch(0.293 var(--neutral-chroma) var(--neutral-hue));
  --surface-5: oklch(0.321 var(--neutral-chroma) var(--neutral-hue));
  --surface-6: oklch(0.348 var(--neutral-chroma) var(--neutral-hue));
  --surface-7: oklch(0.375 var(--neutral-chroma) var(--neutral-hue));
  --surface-8: oklch(0.402 var(--neutral-chroma) var(--neutral-hue));
 
  /* State overlays flip to white-on-black */
  --surface-hover: oklch(1 0 0 / 0.06);
  --surface-active: oklch(1 0 0 / 0.08);
  --surface-selected: oklch(1 0 0 / 0.1);
  --surface-rim-color: oklch(1 0 0 / 0.04);
 
  /* Dark-only tokens used by the rim recipe */
  --surface-hi-base: oklch(1 0 0 / 0.01);
  --surface-hi-mid: oklch(1 0 0 / 0.02);
  --surface-hi-high: oklch(1 0 0 / 0.04);
  --surface-hi-peak: oklch(1 0 0 / 0.06);
  --surface-ring-base: oklch(1 0 0 / 0.02);
  --surface-ring-mid: oklch(1 0 0 / 0.04);
  --surface-ring-high: oklch(1 0 0 / 0.06);
 
  --surface-shadow-near: oklch(0 0 0 / 0.18);
  --surface-shadow-mid: oklch(0 0 0 / 0.16);
  --surface-shadow-far: oklch(0 0 0 / 0.14);
  --surface-shadow-ambient: oklch(0 0 0 / 0.12);
 
  /* Drop-shadow + outer-ring portion of the dark recipe (no insets here) */
  --surface-shadow-1: 0 0 transparent;
  --surface-shadow-2: 0 1px 1px -0.5px var(--surface-shadow-near);
  --surface-shadow-3:
    0 0 0 1px oklch(0 0 0 / 0.12), 0 1px 1px -0.5px var(--surface-shadow-near),
    0 3px 3px -1.5px var(--surface-shadow-mid);
  --surface-shadow-4:
    0 0 0 1px oklch(0 0 0 / 0.14), 0 1px 1px -0.5px var(--surface-shadow-near),
    0 3px 3px -1.5px var(--surface-shadow-mid),
    0 6px 6px -3px var(--surface-shadow-mid);
  --surface-shadow-5:
    0 0 0 1px oklch(0 0 0 / 0.16), 0 1px 1px -0.5px var(--surface-shadow-near),
    0 3px 3px -1.5px var(--surface-shadow-mid),
    0 6px 6px -3px var(--surface-shadow-mid),
    0 12px 12px -6px var(--surface-shadow-far);
  --surface-shadow-6:
    0 0 0 1px oklch(0 0 0 / 0.18), 0 1px 1px -0.5px var(--surface-shadow-near),
    0 3px 3px -1.5px var(--surface-shadow-mid),
    0 6px 6px -3px var(--surface-shadow-mid),
    0 12px 12px -6px var(--surface-shadow-far),
    0 24px 24px -12px var(--surface-shadow-far);
  --surface-shadow-7:
    0 0 0 1px oklch(0 0 0 / 0.2), 0 1px 1px -0.5px var(--surface-shadow-near),
    0 3px 3px -1.5px var(--surface-shadow-mid),
    0 6px 6px -3px var(--surface-shadow-mid),
    0 12px 12px -6px var(--surface-shadow-far),
    0 24px 24px -12px var(--surface-shadow-far),
    0 48px 48px -24px var(--surface-shadow-ambient);
  --surface-shadow-8:
    0 0 0 1px oklch(0 0 0 / 0.22), 0 1px 1px -0.5px var(--surface-shadow-near),
    0 3px 3px -1.5px var(--surface-shadow-mid),
    0 6px 6px -3px var(--surface-shadow-mid),
    0 12px 12px -6px var(--surface-shadow-far),
    0 24px 24px -12px var(--surface-shadow-far),
    0 48px 48px -24px var(--surface-shadow-ambient),
    0 96px 96px -48px var(--surface-shadow-ambient);
 
  --surface-rim-1: inset 0 0 0 1px var(--surface-ring-base);
  --surface-rim-2:
    inset 0 1px 0 0 var(--surface-hi-base),
    inset 0 0 0 1px var(--surface-ring-base);
  --surface-rim-3:
    inset 0 1px 0 0 var(--surface-hi-mid),
    inset 0 0 0 1px var(--surface-ring-base);
  --surface-rim-4:
    inset 0 1px 0 0 var(--surface-hi-mid),
    inset 0 0 0 1px var(--surface-ring-mid);
  --surface-rim-5:
    inset 0 1px 0 0 var(--surface-hi-high),
    inset 0 0 0 1px var(--surface-ring-mid);
  --surface-rim-6:
    inset 0 1px 0 0 var(--surface-hi-high),
    inset 0 0 0 1px var(--surface-ring-high);
  --surface-rim-7:
    inset 0 1px 0 0 var(--surface-hi-peak),
    inset 0 0 0 1px var(--surface-ring-high);
  --surface-rim-8:
    inset 0 1px 0 0 var(--surface-hi-peak),
    inset 0 0 0 1px var(--surface-ring-high);
 
  --surface-shadow-combined-1: var(--surface-shadow-1), var(--surface-rim-1);
  --surface-shadow-combined-2: var(--surface-shadow-2), var(--surface-rim-2);
  --surface-shadow-combined-3: var(--surface-shadow-3), var(--surface-rim-3);
  --surface-shadow-combined-4: var(--surface-shadow-4), var(--surface-rim-4);
  --surface-shadow-combined-5: var(--surface-shadow-5), var(--surface-rim-5);
  --surface-shadow-combined-6: var(--surface-shadow-6), var(--surface-rim-6);
  --surface-shadow-combined-7: var(--surface-shadow-7), var(--surface-rim-7);
  --surface-shadow-combined-8: var(--surface-shadow-8), var(--surface-rim-8);
 
  --chrome-shadow:
    0 0 0 1px oklch(0 0 0 / 0.7), inset 0 1px 0 0 oklch(1 0 0 / 0.065);
}
 
@theme inline {
  /* Colors */
  --color-background: var(--background);
  --color-foreground: var(--foreground);
  --color-card: var(--card);
  --color-card-foreground: var(--card-foreground);
  --color-popover: var(--popover);
  --color-popover-foreground: var(--popover-foreground);
  --color-primary: var(--primary);
  --color-primary-foreground: var(--primary-foreground);
  --color-neutral: var(--neutral);
  --color-neutral-foreground: var(--neutral-foreground);
  --color-chrome: var(--chrome);
  --color-secondary: var(--secondary);
  --color-secondary-foreground: var(--secondary-foreground);
  --color-muted: var(--muted);
  --color-muted-foreground: var(--muted-foreground);
  --color-accent: var(--accent);
  --color-accent-foreground: var(--accent-foreground);
  --color-destructive: var(--destructive);
  --color-destructive-foreground: var(--destructive-foreground);
  --color-border: var(--border);
  --color-input: var(--input);
  --color-input-elevated: var(--input-elevated);
  --color-ring: var(--ring);
  --color-scrollbar: var(--scrollbar);
 
  /* Sidebar colors */
  --color-sidebar: var(--sidebar);
  --color-sidebar-foreground: var(--sidebar-foreground);
  --color-sidebar-primary: var(--sidebar-primary);
  --color-sidebar-primary-foreground: var(--sidebar-primary-foreground);
  --color-sidebar-accent: var(--sidebar-accent);
  --color-sidebar-accent-foreground: var(--sidebar-accent-foreground);
  --color-sidebar-border: var(--sidebar-border);
  --color-sidebar-ring: var(--sidebar-ring);
 
  /* Status colors */
  --color-danger: var(--danger);
  --color-danger-foreground: var(--danger-foreground);
  --color-danger-border: var(--danger-border);
  --color-warning: var(--warning);
  --color-warning-foreground: var(--warning-foreground);
  --color-warning-border: var(--warning-border);
  --color-info: var(--info);
  --color-info-foreground: var(--info-foreground);
  --color-info-border: var(--info-border);
  --color-success: var(--success);
  --color-success-foreground: var(--success-foreground);
  --color-success-border: var(--success-border);
 
  /* Radius */
  --radius-xs: calc(var(--radius) - 6px);
  --radius-sm: calc(var(--radius) - 4px);
  --radius-md: calc(var(--radius) - 2px);
  --radius-lg: var(--radius);
  --radius-xl: calc(var(--radius) + 2px);
  --radius-2xl: calc(var(--radius) + 4px);
  --radius-3xl: calc(var(--radius) + 6px);
  --radius-4xl: calc(var(--radius) + 8px);
 
  /* Easings */
  --ease-in-cubic: cubic-bezier(0.55, 0.055, 0.675, 0.19);
  --ease-out-cubic: cubic-bezier(0.215, 0.61, 0.355, 1);
  --ease-in-out-cubic: cubic-bezier(0.645, 0.045, 0.355, 1);
  --ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
 
  /* Inset shadows for bordered elements (applied to before pseudo-element inset by 1px) */
  --shadow-inset: 0 1px 2px 0 oklch(0 0 0 / 0.08);
  --shadow-inset-highlight: 0 -1px oklch(1 0 0 / 0.04);
 
  --color-surface-1: var(--surface-1);
  --color-surface-2: var(--surface-2);
  --color-surface-3: var(--surface-3);
  --color-surface-4: var(--surface-4);
  --color-surface-5: var(--surface-5);
  --color-surface-6: var(--surface-6);
  --color-surface-7: var(--surface-7);
  --color-surface-8: var(--surface-8);
 
  /* Generates bg-surface-hover / -active / -selected. */
  --color-surface-hover: var(--surface-hover);
  --color-surface-active: var(--surface-active);
  --color-surface-selected: var(--surface-selected);
}
 
/* Base UI requirements, plus the chrome-surface contract. */
@layer base {
  body {
    position: relative;
  }
  .root {
    isolation: isolate;
  }
}
 
[data-surface="chrome"] {
  --foreground: var(--chrome-foreground);
  --muted-foreground: var(--chrome-muted-foreground);
  --border: var(--chrome-border);
  --muted: var(--chrome-hover);
  --accent: var(--chrome-hover);
  --accent-foreground: var(--chrome-foreground);
  --input: var(--chrome-hover);
  --surface-hover: var(--chrome-hover);
  --surface-active: var(--chrome-hover);
}

Extended Color Variables

Cubby UI extends the standard shadcn/ui palette with additional tokens:

--neutral / --neutral-foreground: Neutral button variant
--danger / --danger-foreground / --danger-border: Error states with background tint
--warning / --warning-foreground / --warning-border: Warning states
--info / --info-foreground / --info-border: Informational states
--success / --success-foreground / --success-border: Success states
--sidebar-*: Dedicated sidebar color tokens
--scrollbar: Scrollbar thumb color

Brand-hue tint controls

Three tokens at the top of :root control the warmth of the entire neutral palette:

--neutral-hue: hue angle (0–360). The default 270 is a cool violet.
--neutral-chroma: chroma for mid-tone neutrals. The default 0.004 is barely tinted.
--neutral-chroma-low: chroma for near-extreme L (very light / very dark). Kept lower because high chroma at the extremes looks garish.

Change these to retune the whole stack. Every neutral surface, foreground, and sidebar color references them. Try --neutral-hue: 220 for a cooler blue tilt or 30 for a warm tan tilt.

Surface elevation system

Cubby UI ships with an 8-level surface elevation ladder used by Cards, Popovers, Dialogs, Sheets, Drawers, and more. Each level has paired tokens:

--surface-1 through --surface-8: Substrate colors (light: pure neutrals; dark: progressive lightness with brand tint)
--surface-shadow-1 through --surface-shadow-8: Drop-shadow recipes (composed from --surface-shadow-ring/near/mid/far/ambient)
--surface-rim-1 through --surface-rim-8: Inset highlight + ring (no-op in light, painted in dark)

State overlays raise an underlying surface by a fixed perceptual delta:

--surface-hover: hover state overlay
--surface-active: pressed state overlay
--surface-selected: selected state overlay
--surface-rim-color: single-edge rim color (used by viewport-flush Sheet/Drawer)

For the full elevation system docs, see Surfaces.

Form-field tokens

Form fields (Input, Textarea, Checkbox, Radio, etc.) use three dedicated tokens:

--input: Default bg, aliased to --surface-3 so it matches Card surfaces
--input-elevated: Translucent overlay for the elevated variant, adapts to any substrate (use inside Cards, Dialogs, popovers)

See the Forms guide for when to use which variant.

Base UI Requirements

The @layer base section includes styles required for Base UI components to work correctly:

body { position: relative } - Fixes backdrop positioning issues on iOS Safari for dialog and popover components.
.root { isolation: isolate } - Creates a stacking context for Base UI's portal-based components (dialogs, popovers, tooltips). Apply the root class to your application wrapper element as shown in the Installation guide.

Dark Mode

For dark mode setup, see the shadcn/ui Dark Mode guide.